Conclusions
Reversible structural isomerization of 1,3- and 1,2-dimethylsubstituted cyclopentadienes, proceeding according to a mechanism of 1,2-shift of the methyl group from the 5-position of the cyclopentadiene ring, accompanied by the migration of the system of intracyclic double bonds, is carried out at the temperatures 400–500°. In conjunction with the 1,2-shift of hydrogen, the indicated conversion leads to the formation of an equilibrium mixture of structural isomers, containing 38% 1,3-dimethylcyclopentadienes and 62% 1,2-and 2,3-dimethylcyclopentadienes (total).
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For communication 36 of this series, see [1].
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1978–1983, September, 1971.
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Mironov, V.A., Ivanov, A.P., Kimel'fel'd, Y.M. et al. Cyclic unsaturated compounds. Russ Chem Bull 20, 1864–1868 (1971). https://doi.org/10.1007/BF00854407
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DOI: https://doi.org/10.1007/BF00854407